Battery charger



FIG. 1 is a front perspective view of a battery charger showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is the opposite side view of FIG. 2;

FIG. 5 is a top view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front view thereof. 

The ornamental design for a battery charger, as shown and described. 